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A is corrent because under Rule 10b-5 it is unlawful to use any manipulative or deceptive devices in the purchase or sale of securities if the mail, interstate commerce, or a national stock exchange is used.
B is incorrect because no exemption exists for securities registered under the 1933 Act. The rule applies in the purchase or sale of securities if the mail, interstate commerce, or a national stock exchange is used.
C is incorrect because the rule is not limited to securities subject to the 1934 Act but applies to any sale of a security if interstate commerce is used.
D is incorrect because under Rule 10b-5 it is unlawful to use any deceptive devices in the purchase or sale of securities if the mail, interstate commerce, or a national stock exchange is used. Therefore, a transaction involving the mail or interstate commerce is also within the rule’s scope.